Nokia 3500c Hands Free, Ringer Speaker No Audio Sound Solution

Here's the solution for NOkia 3500 classic No Hand Free Speaker sound can be heard repair solution. If you ever tried checking and ensuring that loud speaker seem working but still there is no audio sound can be heard on the device when hands free is activated. This solution shows particular PCB board components that may possibly faulty or damaged and cause the Nokia 3500 not have an audio sound output over the speaker.

Nokia 3500c Hands Free & Ringer Speaker No Sound Solution

Ensure the speaker is working, replace if the sound is distorted.
Check the connected filter coils on the circuit, replace if found damaged.
Trace the line paths, mend a jumper wire if found open circuit.
If the line paths and the filter coils are okay, rework the audio IC (RETU). Replace if does not solved the problem.

Nokia X6 Camera, Slider Lock, Volume Up and Volume Down Control Button Switches malfunction solution

Here's solution if something went wrong with Nokia X6 camera button and volume control switches that stop responding when being pressed. Button and switches may stop to function if being broken or damaged and sometimes cause by an oxidation. Simply by replacing it will fix the problem.
If the said button switch is okay seems working but still unresponsive you may then consider that the problem may lies on a faulty circuit components on the PCB board.



This solution below shows the line paths of each particular button switches of the camera, slider lock and the volume up and volume down buttons.

Nokia X6 Camera, Slider Lock, Volume Up and Volume Down Repair solution

Repair Hints: 
 Ensure that the button switches is perfectly clean and working okay.
 There is an EMI-ESD filter IC is connected to each button switches line paths., Check this filter IC and trace the corresponding button switches line paths first before trying to replace it.
The Volume up control switch is connected directly to the I/O expander chip, you may check and rework this
chip if only the volume up is not working without touching the ESD filter IC.

Nokia X6 Send, E60 and END keypad keys failure solution

If the Send, E60 and End key button keys failed to respond on Nokia X6, and you already tried to restore, reset, flash and update the device firmware but nothing happens.
Keypad keys malfunction on Nokia X6 may also possibly caused by a faulty keypad flex, cleaning or by replacing it will help solved the problem.

Nokia X6 joystick flex cable wire

If after replacing and ensuring that the flex is okay but the keys still unresponsive, you may then consider that the problem lies on a faulty keypad circuit's  hardware components on the PCB board. This solution below will tell us which components holds and controls the keypad keys to function or work.

Nokia X6 Send, E60 and End key malfunction solution

Check the keypad pin connector first ensure that it is free from dirt and oxidation.
From the keypad pin connector there are three line filter coils located near to it, have a check on this components and replace if found damaged.
From the keypad filter coils the lines is feeds to a keypad filtering chip or keypad IC, you may then check this chip, trace its line paths and replace if found damaged.
The I/0 Expander Chip is the keypad controller components, which holds and control the keypads including the Touch Control Module. You may also rework or replace this chip for further harder keypad problem repair on Nokia X6.

Nokia N97 mini white, blue and blank screen display problem solution

A display problem like, white screen (WSOD), blue screen, blank or black screen, saturated and garbled screen displays, can be cause  by a  faulty or damaged LCD screen display and can be fix by installing anew LCD replacement on it. Sometimes an interrupted firmware also causes the problem and can be fix by restoring the device firmware. IF all of the above does not solved the problem you may then consider that the problem lies on the hardware components failures.

The solution below will show us a particular hardware components that holds and control the display data signals on Nokia N97 mini which enable the LCD screen to work.

Nokia N97mini Display Problem solution

The LCD display connector may also cause the problem if being corroded and oxidation occurs, cleaning it  first is a good idea.
If the device suffered like wet damaged, accidentally heavily dropped the display controller IC and its particular line paths  may also possibly damaged. Reworking and tracing each corresponding line tracks  will help fix display problem on Nokia N97 mini.

Nokia X6 Camera Failure Problem Solution - hardware repair solution

Before using or applying this solution ensure to restore,flash and update,
the device firmware on Nokia X6. Oftentimes camera failure is cause by an interrupted firmware, restoring or flashing it back again will fix the problem. But
if that does not solved the problem you may then proceed to hardware repair troubleshooting, especially
if the device suffered from wet damaged and accidentaly dropped by the user.
The problem may possibly lies on faulty hardware components.



This solution below shows the main camera circuit on Nokia X6 and can be used as a guide to fix and repair camera hardware failure issues.

Nokia X6 Camera Hardware Problem Solution

Camera Repair Tips:
a) Try to replace a new camera replacement module.
b) Check and clean the camera connector.
c) Do supply voltage measurement on corresponding camera supply voltages (see solution above). You can check this voltages while trying to enable the camera in ON condition.
    There are three voltage converters circuit that feeds voltage to enable the camera. This voltage  ranges are as follows, 1.8volts, 2.8volts and 1.3volts  DC voltages.
     This voltages are converted by a DC to DC converters chip. The chips converts the Battery voltage which is 3.7 volts and drop it down or minimize it to 1.8, 2.8 and 1.3 DC voltage.
  So, ensure that the battery supply voltage is properly feeds to each of the DC converter chips.
If  the battery supply voltage is present and still there is no voltage output you can read on each chip, you may then check or replace the DC to DC converter IC's.

d) If all voltages reading is working good and no problems found, but the problem still exists, you may then proceed to rework or replace the Camera Accelerator IC this chip holds and control the camera data signals before it feeds to the application processor IC.

Nokia X6 No Network Signal Reception problem solution - hardware repair solution

Here's the solution that may help and guide to repair Nokia X6 having a No Network Signal reception. If ever tried to  restore and update the device firmware but nothing happens, this solution shows the corresponding  RF circuit of Nokia X6 PCB board that might something wrong, faulty or being damaged.

Nokia X6 No Network Signal problem solution

Repair Tips:
1. Apply and supply voltage to the PCB board using desired DC regulated power supply voltage of 3.7 volts. Check the supply voltage from the cellphone's battery through to the corresponding components highlighted in red color, these are battery supply voltage filter coils that being feeds to RF circuit components. IF there are no voltage readings on that areas, check the continuity of the battery positive terminal on that certain parts. Apply jumper if the line is cut or open. check also the filter coils and replace if found damaged.
2. Check and measure the secondary voltage output from the RF DC to DC converter chip highlighted in orange color. If there is no voltage readings on that spots, rework or replace the DC to DC converter IC.
3. Check or replace the Clock crystal oscillator. (VCTXO)
4. Rework or replace RF Power Ampilifier IC (PA)
5. Rework or replace Front End Module IC (FEM)
6. Rework or  replace Radio Frequency IC (RF IC)

Nokia X6 Touch Screen Problem Solution

If ever trying to fix Nokia X6 touch screen failure issues and you'll do replacing the touch plate module, trying to calibrate the touch screen setting but unresponsive and restoring, upgrading and flashing the device firmware but nothing happens, the problem still exist and the touch screen left unresponsive.
This sometimes happens if the device suffered due to a wet damaged, heavily dropped and any related damaged accidentally done by the user. In this case only a hardware repair may only help solved the problem.
This solution below show the Nokia X6 PCB board components that holds and control the touch screen panel to work.

Nokia X6 Touch Screen Failure Solution

The solution above showed  a Touch Accelerometer chip that   used to sense orientation,  detect direction in multi-access direction of the Touch  Plate module. If the chip is damaged the touch screen will not work and remains unresponsive. This chip needs a DC supply voltage of 2.78 volts in this designed on Nokia X6 and also. The 2.78 Dc volts is also feeds and supply the touch plate module.
You may check this supply voltage first before trying to rework, re-ball or replacing the touch accelerometer  chip.

Nokia N92 Full Keypad Solution - With keypad IC Jumper Ways

Here's a full keypad solution that may useful and possibly help fix and repair Nokia N92 keypad problem or failure. If any certain keys will not been able to function this solution will show you each keypad keys line tracks and connections, including the keypad filter IC that may also cause the keypad keys failed to function if damaged or faulty.

Nokia N92 Keypad Keys Malfunction Solution

 Nokia N92 keypad IC jumper ways

There are two keypad ESD filter is being used on the keypad circuit of Nokia N92, (see solution above).
The small keypad IC holds the volume UP and DOWN control and the Camera Shutter button, and some  group of keys.
The bigger one holds all the keypad keys, if this keypad filter IC is damaged all of the key will not respond or unable to function. By only replacing it with a new one will only possibly fix or repair the keypad problem on Nokia N92.

Nokia 2700 classic Power ON/OFF Key Solution - Switch button jumper ways

Here's the solution  that may help fix and repair Nokia 2700 classic Power problem. This solution is for Nokia 2700 classic that shows charging indication but doesn't  get On or power up when pressing the power key switch button.  Although this solution came late but  still there are many who are looking and requesting  this solution.

Nokia 2700C Power On -Off key Switch Line Tracks

There is line test spots near the Keypad filter IC that can be easily check the power/ end key line paths, just apply a jumper wire if that line is open or cut.
If the said line spots is okay, you may need to check and replace the upper Keypad Filter IC.

Nokia X6 Bluetooth, WLAN and GPS solution - hardware repair solution

Bluetooth, Wireless LAN and GPS connection  problem can be cause by a firmware failure and can be easily be fix by restoring, updating or flashing the phones firmware again. But after doing any firmware repair and the problem still exists the problem may certainly lies on the hardware components failures.

This solution below  may possibly useful and help fix and repair Nokia X6 Bluetooth, WLAN and GPS problem issues for it shows the Bluetooh, WLAN and GPS component circuit.

Nokia X6 Bluetooth, Wireless LAN and GPS solution

Repair Hints: Ensure that the firmware of the device is successfully calibrated, upgraded and restored.
1) Check all corresponding supply voltages in the circuit
2) Check the RF buffer clock  feeds from the RF circuit
3) Check the Bluetooth and WLAN antenna
4) Rework the Bluetooth IC first,  the WLAN will not work if the Bluetooth IC is faulty.

Nokia X6 Insert Sim Card Problem Solution

Insert SIM card problem may happen and shows on the LCD screen display, if the SIM card inserted on the mobile phone device is already damaged but IF the SIM card card is working good and the device handset will not accept any kind of SIM card, the problem may lies on the device itself. This may happen if the mobile phone is damaged by a liquid or water damaged and any means of accidental damage by the standard user.

Here's solution that may help possibly help fix and repair Nokia X6 Insert SIM card problem.

Nokia X6 Insert SIM card Solution

 This solution shows the SIM card circuit on Nokia X6, including The line tracks of the SIM card pin connector through to each corresponding solder ball bumps of the IC components (AVILMAS) that holds the SIM card to work.

Nokia X6 Ringer, Hands Free Speaker no audible sounds solution

This solution covers and may possibly help solved Nokia X6 Ringer and and Hands free loud speaker No sounds can be heard. You may need to ensure that the loud speakers is working well before applying this solution.

Nokia X6 Ringer and Hands Free Speaker No sounds problem solution

In Nokia X6 the handsfree speaker came with two channel the left and the right channel or so called stereo type. The audio signal is feeds from the power and audio chip (AVILMAS) and feeds to a audio amplifier IC to boost and amplify the sounds intensity.
You may need to check, trace, replace and rework those corresponding components indicated on the solution picture above.

Nokia X6 Digital Mic, mouthpiece microphone problem Solution

Here's the solution that might possibly help solve Nokia X6 mouthpiece microphone failure, a problem that no audio sounds can be heard from the other receiving device during a call is created.

Nokia X6 Microphone sound failure solution

The red lines indicated in the solution above is the microphone's supply voltage if this voltage is cut or not present the mic will not tend to work. There are also resistors that where the digital audio signal is flow across to this components that has a resistance value of 100ohms each, check and replace it first  before attempting to replace the Digital Microphone Module.

Nokia X6 Earpiece Speaker No Audio Sound Solution

if having tried to fix Nokia X6 Earpiece Speaker Problem that No Audio sound output can be heard and you already check  speaker is okay and also already  tried replacing the Flex cable wire but he problem unsolved. This solution might possibly help to solved the problem.

Nokia X6 Earpiece Speaker problem solution

If the earpiece speaker and flex cable wire is working okay, those particular components highlighted on the solution might causes the problem if the device is severely damaged by any means of liquid or water damaged. Start to check on the flex pin connector and way down toall corresponding components composed of filter coil and bypass ESD resistor, replace at once if found open or shorted. If the filter coils were okay you may need to rework the power and audio IC (AVILMAS) trace the line paths first while the IC is being removed, then reball the IC, clean the solder balls surface and inplaced it back again.

Nokia X6 microUSB to PC connection, not detected problem Solution

If having problem connecting from USB to PC on Nokia X6, this solution may help if the device is not detected after ensuring that the USB cable wire is okay. The device driver is properly installed but the problem still exists.

This solution shows the particular components might caused faulty or damaged and result to a problem connecting to the PC through USB port.

Nokia X6 USB Not detected Solution

Repair hints: Check the microUSB connector if damaged, oxidated or corroded, clean or replace it.
 Check the filter coil and ESD protection chip, replace if found damaged. If the problem still persists check the power supply of the USB transceiver IC, it is conneted to the battery positive line voltage,  if the voltage is okay, rework or reball the USB transceiver IC.

Nokia X6 Charger Not Supported Solution

Here's a solution that shows the location of BTEMP resistor that caused Charger Not supported on Nokia X6 if damaged. This components needs to replace if cahrger not supported shows on the LCD screen display when the battery charger is being plug-in.

X6 Charger Not Supported btemp resistor location

This Btemp resistor rated value is 47K. You may easily find it on other non working Nokia PCB board.

Nokia C5 hardware solution - No Earpiece Speaker Audio Sound solution

Here's a solution that may help fix and repair hardware related damaged on Nokia C5 No Earpiece Speaker Audio Sound  output. If the earpiece speaker already been check and seems to be working fine but still no audio sounds can be heard. you may need to check those certain components indicated on the solution.

Repair hints:
1. Check/replace the ear speaker
2. Clean the speaker terminal pads
3. Check/replace the filter coil
4. Check/ replace the ESD filter or remove it,

Nokia C5 Charger Not Supported Error Problem Solution

This solution may help fix if the Nokia C5 shows "charger not supported error when the battery charger is plug-in. If the error message shows, this probably cause by a faulty hardware components on Nokia C5 PCB board.

Just refer to the solution below and locate the highlighted components for it is part of  the charging indication components.

Nokia C5 Charger Not supported problem solution

Hints for repair a Nokia C5 charger not supported problem:
1. Try to use another phone's battery and charger.
2. Check/clean the battery terminals and connector
3. Check/ replace the 47K resistor as shown on the solution above

Nokia C5 Not Charging Problem Repair Solution

Here's the solution for Nokia C5 Not Charging problem , this simple solution provides the basic details on how to fix the problem. Just refer to the solution below and follow some steps procedures on how to troubleshoot the problem.
This solution may works on 'charger no response indication' when any working battery charger is plug-in to the DC jack.

Nokia C5 Not Charging problem Solution

Repair hints for Nokia C5 Not Charging problem:
1. Visually check the charging pin connector( DC jack) for possible damaged, clean,fix if the terminals is misaligned or replace it.
2. Clean the charging pin terminal contact pads.
3. Check the battery and try using another working phone's battery.
4. Check the battery terminals, clean if oxidized.
5. Check/replace the fuse
6. Check /replace the chip diode
7. If the above procedures doesn;t fix the problem, the possible faulty is the GAZOO IC, reworking or replacing it will only fix the problem.

Nokia X6 LCD Display Problem Full Solution

Here's a solution that can be used to fix and repair Nokia X6 Display problem issues like white screen, blue screen, blank screen, garbled and saturated screen displays.. This solution may help if having a LCD display problems and already tried to upgrade or restore the device  firmware and  replaced it with a new LCD module replacements but the problem  still exists.

Nokia X6 LCD Display  solution

There are two voltage supply that also need to the LCD display to work, the 1.8 volts and 2.78 volts.The solution above alao shows particular components that needs to check and replace if found faulty or damaged like the Display  ESD-EMI filter IC.

If those supply voltages seems to be okay and the LCD display ESD-EMI filter IC is working well and already been checked and replaced the solution below shows the next components that also needs to check, rework or replace. On Nokia X6 there is a display controller IC that is being used and connected on the LCD display circuit.

Nokia X6 Display problem solution ( Display controller IC )

If the LCD display controller chip become faulty or damaged this will also result to a display problem issues on Nokia X6. But before trying to reflow, rework or replaced you  need to check first the three filter coils connected near to it and trace each line paths to the LCD pin connector.

Nokia X3 Hands Free Ringer speaker No audio Sounds Solution

This solution covers to fix and repair Nokia X3 Hands Free Speaker No audio sounds can be heard or No ringtone sounds. the solution below shows particular components that needs to be check  or by then replace if found damaged. If the loud speaker component is working well when checked up, you may proceed to check this highlighted  components showed below, for it where the audio sounds signals is feeds from the audio IC module.

Nokia X3 hand free, Ringer Speaker No Sounds solution

Those components were composed of filter coils, it is easy check each of them by using a multimeter in a continuity test method. There are two channels in Hands Free speaker circuit the left speaker channel and the right channel. If only one channel is not working, you may concentrate only on that certain part. Just configure the solution above.

Nokia X3 No LCD and keypad backlight LED solution

Here's a solution that may possibly help fix and repair Nokia X3 Failure of LED backlight  on keypad and LCD screen display. This solution completely shows the lines paths and particular components that may need to check and replace if the LED backlight failed to light up.

Nokia X3 No LCD and keypad backlight LED repair solution

There is a fusible resistor is been connected to the LED backlight circuit in case a short circuit occurred if the device is being damaged by a liquid (Wet Damaged). See solution above marked with number 1.
That resistor is the one feeds the power supply from the phones battery.
If that resistor is open both keypad and LCD display LED's will not light up for it is the main LED supplying positive voltage.
The negative current or voltage has two circuits, one for the LCD (marked with number 4) and the other one is for the keypads (marked with number 3).
You may check / replace each particular corresponding  connected components highlighted on the picture for further troubleshooting.

 Nokia X3 LCD and keypad backlight LED failure solution

Nokia C3 Display Problem Solution - White, blue blank screen displays solution

Here's a solution that may possibly help fix and repair Nokia C3 display problem like white screen, blue screen, blank screen, garbled and saturated screen displays.
Note: this solution may only work and can be applied after ensuring that:
a) the Flash firmware is okay
b) the LCD Display module is okay or have tried replacing it with a new one

This solution below shows the display circuit  connection of Nokia C3 and its corresponding line connections including the pin connector's pin configuration.

Nokia C3 Display problem solution ( LCD pin connector's line tracks)

Repair Tips:
1. Check the LCD pin connector, make sure it is free from dirt, oxidation and corrosion. Clean it and apply solder if the pins found a cold solder or broken.
2. Check the two voltage supply it is 1.8 and 2.8 DC volt(see solution above)
3. Check the connected two resistors near to the pin connector this two resistor has a value of 0 ohms and 100 ohms. replace if found damaged.
4. If all of the above components is okay, the last and hard enough to deal with  is reworking the JUNO chips. For beginners, you may  ask assistance to your Head Technician or Master Tech, working with JUNO IC  needs expertise, so apply extra precautions.

Nokia X3 Display problem solution, Full Display IC Jumper ways

Here's a full display problem solution for Nokia X3, If you ever having tried to replace a new LCD module replacement and updating the firmware by only trying to fix a Display problem, like White screen, Blue screen, blank screen, garbled, saturated and etc on X3. but the display problem still unsolved.



This solution below shows the connection of display ESD filter IC to each certain pins of the B2B connector.

Nokia X3 display problem solution

 Nokia X3 display IC line tracks

If the the Display ESD filter chip is damaged this will result to display problem issues. By replacing them will only possibly solved the problem.

Nokia X3 keypad problem full solution

Here's a full solution of Nokia X6 keypad problem and failure. This solution shows the complete line tracks for easy tracing particular keys that stop responding including the camera and volume control switches button.

 Nokia X3 keypad keys, camera and volume control button switches solution

Each key were group in one line of connection, each connection is filtered by an ESD filter IC. The solution above shows how each certain keys are being connected to the keypad filter IC. There are three keys commonly connected together in one line of connection, therefore if only one or two key is not working, you may consider that the problem lies only on an open path of connection. If there are three and above keys does not work you may considered that the keypad ESD filter is damaged or faulty.

Nokia 5700 White screen and Blue Screen Display Problem Solution

 If having tried to repair Nokia 5700 display problem issues and you installed a new LCD display module replacement on it but the problem still exists, This solution  may help fix and repair Nokia 57000 display problem issues like white screen, blue screen, blank screen, garbled screen and other related display problem that is not caused by the LCD display module.

Nokia 5700 Display Problem solution

( white screen, blue screen and blank screen display repair)

There are two ESD-EMD filter is connected in the display circuits, If these ESD filter has been damaged it will result to display problem issues. Replacing it will possibly solved the display problem issues like white screen, blue screen, blank screen, garbled and saturated screen displays.

Nokia 5030 Charging problem solution - Charger No Response Repair solution

Having a Charger No Response indications is a sign of a defective battery charger, charging pin connector and some of the components on the PCB Board like the chip fuse is being busted or damaged.
This solution below may possibly help fix and repair Nokia 5030 Charger no response indication. It shows the location of chip fuse on the main pcb board that needs to check and replace when a charger no response occurred.

Nokia 5030 Charger No response  solution (Not charging Repair)

The chip diode may also damaged and cause short circuit, a shorted diode make the chip fuse blown again, replace it if found shorted.

Nokia 5030 Ringer, hands free loud speaker no sounds output repair solution

Here's a solution that solved, fix and repair Nokia 5030 Ringer Speaker no sounds output problem.
This solution shows the components that might also possibly damaged if the speaker does not have a sounds output. After ensuring that the loud speaker module is working okay, you may also check or by then replace the components showed on the solution below.

 N- 5030 Ringer, Hands Free Speaker No Audio Sounds Repair solution

The Ringer audio sounds signal is feeds from the UEM IC, therefore for further troubleshooting you may also try to rework the UEM IC if all of those components above including the loud speaker is working well.

Nokia 5030 White screen and Blue, Blank LCD Display solution

Here's a solution to solved Nokia 5030 xpressradio Display problems such as White Screen, Blue scree, blank screen, black screen and any related display failures.
This solution shows the display line tracks connection from a certain components to the LCD pin connector.

5030 LCD display problem solution (display jumper ways)

The display data signals is feed from the application processor then each line is filtered by resistor before it gets through to the LCD module.

Nokia 2690 Earpiece Speaker No Audio Sounds Solution

Here's the solution that may possibly help fix and repair Nokia 2690 Earpiece Speaker No audio sound output problem.

2690 earpiece speaker jumper ways

You may need to ensure and check that the earpiece  speaker is working before replacing those components composed of filter coil and an ESD filter. If all of those components were all seem good the problem may lies on a broken line paths from the power and audio IC (AVILMA). So , for further troubleshooting you may need to rework the power supply chip that might possibly fix and repair Nokia 2690 Earpiece Speaker Sounds problem.

Nokia 2710ne camera hardware failure problem repair solution

This solution shows the camera module circuit of nokia 2710 navigation edition. If the camera failed to initiate, this solution might help fix and repair the problem. If already tried to restore it's firmware but the problem still exists, this solution shows the tracks of the Camera module supply voltages that needs to check before attempting to replace the camera module assembly.

Nokia 2710ne camera problem repair solution

There are three power supply voltages that makes the camera module works and operate if one of these voltage were missing the camera  will not function, and it shows camera hardware failure, camera on standby and either no reactions or indication at all.
A Camera on standby mode may fix by restoring it's firmware. If an empty or black screen showed on the LCD display screen,  the problem may lies on the camera module itself, replacing it will possibly solve the problem. So first ensure that the firmware is secured before proceeding to hardware troubleshooting.

Nokia 2710NE Keypad repair solution - keypad IC, flex and pin connector line tracks solution

This solution shows the connection of the Nokia 2710 navigation edition keypad connections from the keypad matrix flex through to the keypad pin connector and  keypad filter IC's.

2710 Keypad keys connection configuration on the flex keypad matrix

And this solution below show the keypad connection from  each particular solder ball bumps of the keypad filter IC. This also includes the nokia 2710ne camera switch connection tracks

Nokia 2710 keypad IC jumper with camera switch line tracks

Nokia N78 White, Blue, Black and Blank Screen Display problem solution

 This repair solution below may possibly help fix and repair a damaged Nokia N78 displays like white screen, blues screen, garbled, blank or black screen and some related display problems and failure.

N78 Display problem solution

N78 Display IC jumper ways solution

Repair Hints: There are two Display filtering chips used in the circuit, if already tried and replaced those both filter IC you may then also rework or replace the Display IC marked with number 3.

Nokia N78 keypad malfunction solution with keypad filter IC jumper ways solution

Here's a solution that may help fix and repair Nokia N78 keypad failure or malfunction. If you already tried to replace the keypad flex cable but the problem still exists, this solution below will show you the keypad filter IC that is being connected to eah particular keys within the keypad matrix.

N78 Keypad Filter IC connection tracks

You may trace each particular line paths for deep keypad repair troubleshooting.

Nokia 2690 White Screen, Blue and Blank Screen LCD Display Problem Solution

Here's a solution that may possibly help fix and repair Nokia 2690 LCD Display problems like white screen, blue screen, black or blank screen displays. If you're having tried to replace a new LCd display module replacement when trying to repair display problem on Nokia 2690 but nothing happens and the problem still exists. This solution below shows the connection of LCD display data signals from the application processor chip to  each single pins of the LCD connector.

2690 LCD display connection line tracks ( display jumper ways)

The solution above shows a detailed information of the display data signal being feeds from the application processor IC to the LCD display pin connector. Each line is been filtered by a resistor that has resistance value of 33ohms each. You may check each resistor and trace each particular line paths, replace the resistor if found damaged or by then apply a jumper for an open line or cut connections.

Nokia 2690 keypad IC jumper ways and line tracks, full solution

Here's the full and complete solution for Nokia 2690 Keypad line tracks and keypad filter IC jumper ways including the power on-off key connection. This solution below may possibly help fix and repair a certain keypad malfunction that stop responding on a damaged Nokia 2690 cell phones.

Nokia 2690 keypad Line Tracks and filter IC jumper ways solution with power ON/OFF key

Ensure that the keypad membrane is perfectly clean before trying to trace each corresponding keypad keys that is not responding. Majority of each group of connection has three keys are connected together, therefore if only one or two keys are not working, the problem may lies on open line tracks. If more than three or all of keys are not working the problem may lies on a damaged EMI-ESD filter chip.

Nokia N78 Mic,mouthpiece microphone Failure solution

Here's the solution that may possibly help fix and repair a microphone failure on Nokia N78 cell phone handset. In Nokia N78 the microphone line track is connected over the keypad flex cable wire connection. If something went wrong and the microphone failed to have an audio signal output during transmission, The problem may possibly lies on a faulty mouthpiece microphone, a damaged flex cable and a faulty microphone signal line paths. This solution below shows the microphones line tracks that needs to be trace after ensuring that the microphone is okay and the flex cable is also okay.

Nokia n78 microphone failure solution

The microphone's positive terminal line tracks is connected on pin 22 of the keypad pin connector, while the negative terminal is on the PCB grounds. There is also a bypass capacitor connected to it, if the capacitor is oxidated or shorted due to a wet damaged this also result to microphone failure problem.

Nokia N78 Earpiece Speaker No Sounds Repair solution

This solution show the two filter coils and ESD filters that needs to be check or by then replace if there is no audio sounds can be heard over the earpiece speaker On Nokia N78.
Ensure that the speaker is working fine before trying to check and replace those components showed on the solution picture.

Nokia N78 Earpiece Speaker Problem Solution ( No audio sounds repair)

Those components are composed of a chip filter coils and an ESD filter that looks like a resistor and mounted on the top left side of the PCB board.

Nokia N78 Charger No response repair solution, for not charging problem solution

Here's a complete line tracks of Nokia N78 charging circuit that may help fix and repair Not charging issues such as Charger No Response and Fake Charging.

The solution below shows the corresponding components that needs for check up and replacement if found damaged.

Nokia N78 Charger No response solution

When a charger is being plug-in but there is no indication shows on the LCD screen Display. The problem may lies on an open chip fuse or a shorted diode. see picture above..
But ensure first that the charging pin connector is perfectly clean and not damaged before trying to check or replace the above showed mounted components.
IF the chip fuse, filter coils, chip diodes and capacitors is okay the problem may possibly lies on the Charging IC (BETTY IC). Try to reflow/rehea and rework before replacing it. A faulty Charging IC may also result to a fake charging, it means that it  shows a charging indication on the LCD screen display but the battery does not charge up at all.

Nokia N78 Battery Charging problem solution - charger not supported solution

Here's the solution that may possible fix and repair Nokia N78 Charger not supported
problem. This is caused by a damaged battery temperature resistor(BTEMP).
This resistor has a value of 47K, by replacing it might help fix the problem.

Nokia N78 Charger Not supported solution

N78 BTEMP Resistor location

Nokia 2710NE Memory Card Solution - MicroSD Card not detected problem repair solution

When the MicroSD card inserted on the device and nothing happens but it displays "memory card not inserted" something like that, this solution may help fix and repair the problem if the Nokia 2710 navigation edition has been damaged by any means like wet damaged or accidentally dropped.

The solution below shows the particular SMD components that needs to check, trace and replace to possibly fix the problem.

Nokia 2710ne MicroSD memory card problem solution

Repair tips:
1. Check the MMC card detection switch first, you can read a voltage on that area about 1.8 volts if unpressed and 0 volts if pressed.
2. Check and trace the MMC supply voltage it is marked with VSIOD and connected to MMC socket pin #4 then the pin #6 for groundings.
3. If both MMC power supply voltage and MMC detection switch is okay, the problem may lies on the ESD-EMI filter chip. Replace the ESD filter if necessarily.

Nokia 2710NE Insert Sim Card Solution - Insert sim problem repair

Insert Sim card solution for Nokia 2710 navigation edition. This solution may help fix and repair a wet damaged or accidentally dropped nokia 2710 and result displaying "insert sim card" on the LCD screen display.

Nokia 2710ne Insert Sim card repair solution

Repair tips: Check or Trace the VSIM power supply voltage from the power IC to the VSIM pin connector of the sim card holder or socket. Trace all the remaining line tracks indicated on the solution above those are the SIM Data, SIM Clock and SIM Reset line paths. If all of those line paths are okay, you may then replace the SIM EMI-ESD Filter IC. The SIM Filtering IC's internal solder ball bumps connection is also included on the solution.

Nokia N79 LCD Display problem solution - white screen, blue screen, blank screen repair solution

Here's the solution for Nokia N79 display problems such as blue screen, white screen, black or blank screen displays. This solution may help fix for the symptoms after ensuring that LCD screen module is working okay but the problem still exists.
The guide below shows the LCD display data signal line tracks from the display EMI filter IC to the corresponding LCD display B2B pin connector.

Nokia N79 Display IC LineConfiguration

(N79 Display IC Jumper ways)

Repair hints: If the two Display EMI-ESD filter has been change but the problem remains. Do try to rework the display IC marked with number three. Just have the rework station heat controlled about below and not above 350 degrees and have an air flow of 3-5 range. Need extra care for that IC to work with.
P.S. this solution has been posted by special request.

Nokia 3720C Earpiece Speaker solution - No Earpiece Audio Sounds Repair solution

Here's the solution for nokia 3720 classic Earpiece speaker problem, If the earpiece speaker is good and need to have a quick check on the connected components, this solution shows the particular components that may possibly damaged and will result to no audio sounds output over the earpiece speaker.

Nokia 3720c Earpiece Speaker components circuit location 

( Earpiece speaker problem repair)

You may check or by then replace those corresponding SMD components such as filter coils, resistors and capacitors.

Nokia 3720C Hands Free, Ringer loud speaker repair solution

Here's the solution for nokia 3720 classic hands free, ringer loud speaker problem repair. The solution shows the particular components may need to check after ensuring that the loud speaker is working and in good condition.

3720c Hands Free, Ringer loud speaker repair solution

If the loud is speaker is okay but there is no audio sound output can be heard when activating handsfree or ringtone, you may check and by then replace those pasricular components indicated on the solution picture. Those components is composed of a filter coils and ESD protection resistor. Check also the line tracks of each corresponding connection.

Nokia 3720C Mic, mouthpiece microphone repair solution

here's a solution that may help repair a Nokia 3720 classic microphone failure. The solution shown below will help you guide to check and trace the components and tracks for the microphone circuit on Nokia 3720 classic.

Nokia 3720c Mic, mouthpiece microphone problem solution 

(microphone failure repair)

before trying to replace a new DigiMic microphone first try to trace the line paths od digimic supply voltage and the DigiMic clock and then the corresponding chip resistors that is mounted near to it, the three resistors has a resistance value of 100 ohms each.